ON A STRUCTURE OF SUPERFLUID HE-4 ELEMENTARY EXCITATION SPECTRUM

New experimental data of the liquid helium inelastic neutron scatterin g are reported. With the help of two Gaussian fitting procedure it was shown that for wave vectors q > q0 = 0.48angstrom-1, the sharp phonon -maxon-roton peak consists of two modes, thus, elementary excitation s pectrum possesses a complex structure. We can assume that one of these modes belongs to the neutron scattering as on the usual, ''normal'' f luid, while the other mode being connected with the liquid excitations induced by the presence of the bose-condensate.